Viagra (Sildenafil) is a medicine that doctors prescribe to help men who have erectile dysfunction have sex. Erectile dysfunction is the inability of the penis to become rigid (hard), or to stay rigid long enough to finish having sex. Take Viagra 30 minutes to 1 hour before intercourse. Since many consider the hi-cost per dose of Viagra here are some Viagra Alternatives and even Female Viagra listed on the website.

Cialis (TADALAFIL) works fast - within 30 minutes in some patients - and can work up to 36 hours. That means you and your partner can be spontaneous, responding to each other sexually when the moment is right. Of course your results may vary so talk to your doctor today to see if Cialis is right for you. In clinical trials, Cialis was shown to improve the ability of men with ED to have a single successful intercourse attempt as long as 36 hours after dosing. Tadalafil has not been studied for multiple sexual attempts per dose.

Both can have definite side effects; 4 hour erections? It definitely different for every man... try them both and observe the effects. Cialis is a younger drug so we don know its collateral effects over the long term.

The choice is yours.